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high mechanical strength si anode synthesis with interlayer bonded expanded graphite structure for lithium-ion batteries

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journal of Energy chemistry 2024年第6期93卷 253-263,I0007页

作者： Wenhui lai jong hak lee lu shi Yuqing liu Yanhui Pu Yong kang Ong carlos limpo Ting xiong Yifan Rao chorng haur sow barbaros Ozyilmaz Department of Material science&Engineering National University of SingaporeSingapore 117575Singapore center for Advanced 2D Materials National University of SingaporeSingapore 117546Singapore Department of Physics National University of SingaporeSingapore 117551Singapore Institute forFunctional Intelligent Materials National University of SingaporeSingapore 117544Singapore

Despite advancements in silicon-based anodes for high-capacity lithium-ion batteries,their widespread commercial adoption is still hindered by significant volume expansion during cycling,especially at high active mass loadings crucial for practical *** root of these challenges lies in the mechanical instability of the material,which subsequently leads to the structural failure of the ***,we present a novel synthesis of a composite combining expanded graphite and silicon *** composite features a unique interlayer-bonded graphite structure,achieved through the application of a modified spark plasma sintering ***,this innovative structure not only facilitates efficient ion and electron transport but also provides exceptional mechanical strength(Vickers hardness:up to658 MPa,Young's modulus:11.6 GPa).This strength effectively accommodates silicon expansion,resulting in an impressive areal capacity of 2.9 mA h cm^(-2)(736 mA h g^(-1)) and a steady cycle life(93% after 100cycles).such outsta nding performance is paired with features appropriate for large-scale industrial production of silicon batteries,such as active mass loading of at least 3.9 mg cm^(-2),a high-tap density electrode material of 1.68 g cm^(-3)(secondary clusters:1.12 g cm^(-3)),and a production yield of up to 1 kg per day.

关键词： lithium-ion battery silicon anode spark plasma sintering Interlayer bonding Mechanical strength Tap density

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construction of 2D/2D Ti_(3)c_(2)T_(x)Mxene/cds heterojunction with photothermal effect for efficient photocatalytic hydrogen production

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journal of Materials science & Technology 2024年第4期171卷 1-9页

作者： T.Y.huang Z.Yang s.Y.Yang Z.h.Dai Y.j.liu j.h.liao G.Y.Zhong Z.j.xie Y.P.Fang s.s.Zhang key laboratory for biobased Materials and Energy of Ministry of Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China school of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China school of chemical Engineering and Energy Technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of semiconductors to visible and infrared light is a key constraint on the utilization of light energy in photocatalytic *** photocatalysts with full-spectrum absorption through surface engineering is an effective approach to fully harnessing light energy in semiconductor ***,a novel stable Ti_(3)c_(2)T_(x)Mxene/cds heterojunction catalyst is obtained by in-situ epitaxial growth of two-dimensional(2D)cds nanosheets on 2D Mxene interface via a solvothermal *** exceptional light absorption properties of Mxene confer outstanding full-spectrum driven photocat-alytic hydrogen evolution capability upon the heterogeneous *** unique 2D/2D structure effectively mitigated the recombination of photogenerated carriers,enhancing the photocatalytic performance of the ***,the composite catalyst exhibits a significantly higher surface temperature of 80.4℃under visible light irradiation at an intensity of 0.1 W/cm^(2),which is 1.84 times higher than that of *** irradiation of visible and near infrared light,the composite catalyst with photothermal ef-fect demonstrates a remarkable hydrogen evolution rate of 65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of cds *** study introduces a novel approach for constructing full-spectrum absorption catalysts and expands the application of the photothermal effect in photocatalytic hydrogen evolution research.

关键词： Two-dimensional structure heterostructure Photothermal effect Photocatalyst hydrogen evolution

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Double active sites promoting hydrogen evolution activity and stability of coRuOh/co_(2)P by rapid hydrolysis

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chinese chemical letters 2024年第7期35卷 206-211页

作者： bin Dong Ning Yu Qiu-Yue Wang jing-ke Ren xin-Yu Zhang Zhi-jie Zhang Ruo-Yao Fan Da-Peng liu Yong-Ming chai state key laboratory of heavy Oil Processing College of Chemistry and Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China

cobalt-based phosphides show excellent hydrogen evolution reaction(hER)performance,however,improving the intrinsic activity and stability of it in alkaline electrolyte still remains a ***,coRuOh/co_(2)P/cF with heterojunction structure was developed by means of molten salt and rapid hydrolysis(30 s).The Oh-from rapid surface hydrolysis of co_(2)P as a hydrogen adsorption site can facilitate the formation of thin coRuOh layer as a water dissociation site,which may bring out better synergistic effect for alkaline ***,the covering of coRuOh can improve the stability of co_(2)P for *** drives at 100 mA/cm^(2),it only requires overpotential of 81 mV in 1.0 mol/l KOh(25℃).Even at higher current density(1000 mA/cm^(2)),coRuOh/co_(2)P/cF can also operate stability for at least 100 *** coupling with NiFe-lDh/IF in a two-electrode system,the voltage of NiFe-lDh/IF(+)||coRuOh/co_(2)P/cF(-)at 1000 mA/cm^(2)is merely 1.77 V with 100 h,demonstrating great potential for water *** implementation of this work provides a new strategy and reference for the further improvement of transition metal phosphides as hER electrocatalysts.

关键词： coRuOh/co_(2)P/cF Enhanced activity and stability Double active site large current density hydrogen evolution reaction

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Unraveling magnetic properties and martensitic transformation in Mn-rich Ni-Mn-sn alloys:first-principles calculations and experiments

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Rare Metals 2024年第4期43卷 1769-1785页

作者： Yu Zhang jing bai ke-liang Guo jia-xin xu jiang-long Gu Nicola Morley Qui-Zhi Gao Yu-Dong Zhang claude Esling xiang Zhao liang Zuo key laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang110819China key laboratory of Dielectric and Electrolyte Functional Material hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao066004China Department of Material science and Engineering University of SheffieldSheffieldS13JDUK state key laboratory of Metastable Materials science and Technology Yanshan UniversityQinhuangdao066004China laboratoire d’Étude des Microstructures Et de Mécanique des Matériaux University of Lorraine57045MetzFrance

We have investigated the phase stability,magnetic properties,and martensitic transformation thermodynamics/kinetics of the Ni_(24-x)Mn_(18+x+y)sn_(6-y)(x,y=0,1,2)system by combining the first-principles calculations and *** calculation results show that the optimized lattice parameters are consistent with the experimental ***,we obtain the relation equation for the austenite formation energy(E_(form-A))and Mn content(x_(Mn)):E_(form-A)=507.358x_(Mn)-274.126,as well as for the six-layer modulated(6M)martensite formation energy(E_(form-6M))and Ni content(x_(Ni)):E_(form-6M)=-728.484x_(Ni)+*** ternary phase diagram of the total magnetic moment was *** excess Mn will reduce the total magnetic moment of 6M(Mag6M)and non-modulated(NM)(MagNM)martensites,with the following equations relating the total magnetic moment and Mn content:Mag_(6M)=-15.905x_(Mn)+7.902and Mag_(NM)=-14.781x_(Mn)+7.411,while the effect on austenite is *** variation of total magnetic moment is mainly dominated by the Mn atomic magnetic *** 3d electrons of Mn_(sn)(Mn at sn sublattice)play an important role in magnetic properties from the perspective of the electronic density of *** on the thermodynamics of martensitic transformation,the alloys will likely undergo austenite?6M?NM transformation *** the thermodynamic and kinetic results,the martensitic transformation temperature decreases with x increasing and increases with y *** results are expected to provide reference for predicting the phase stability and magnetic properties of NiMn-sn alloys.

关键词： Ni-Mn-sn First-principles calculations Martensitic transformation Magnetic property Kinetics

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Engineering the axial coordination of cobalt single atom catalysts for efficient photocatalytic hydrogen evolution

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Nano Research 2024年第6期17卷 5114-5121页

作者： Ning kang lingwen liao xue Zhang Zhen he binlu Yu jiahong Wang Yongquan Qu Paul Kchu seeram Ramakrishna xue-Feng Yu xin Wang licheng bai Materials Interfaces center Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences(CAS)Shenzhen 518055China key laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Department of chemistry City University of Hong KongKowloonHong Kong 999077China hong Kong branch of National Precious Metals Material Engineering Research center(NPMM) City University of Hong KongKowloonHong Kong 999077China key laboratory of special Functional and smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics and Department of Materials science and Engineering City University of Hong KongKowloonHong Kong 999077China National University of singapore(NUs)centre for Nanofibers and Nanotechnology Department of Mechanical EngineeringNational University of SingaporeSingapore 117542Singapore

Improving the catalytic activity of non-noble metal single atom catalysts(sAcs)has attracted considerable attention in materials *** optimizing the local electronic structure of single atom can greatly improve their catalytic activity,it often involves in-plane modulation and requires high ***,we report a novel strategy to manipulate the local electronic structure of sAcs via the modulation of axial co-s bond anchored onto graphitic carbon nitride(c_(3)N_(4))at room temperature(RT).Each co atom is bonded to four N atoms and one s atom(co-(N,s)/c_(3)N_(4)).Owing to the greater electronegativity of s in the co-s bond,the local electronic structure of the co atoms is available to be controlled at a relatively moderate ***,when employed for the photocatalytic hydrogen evolution reaction,the adsorption energy of intermediate hydrogen(h*)on the co atoms is remarkably *** the presence of the co-(N,s)/c_(3)N_(4)sAcs,the hydrogen evolution rates reach up to 10 mmol/(g·h),which is nearly 10 and 2.5 times greater than the rates in the presence of previously reported transition metal/c_(3)N_(4)and noble platinum nanoparticles(PtNPs)/c_(3)N_(4)catalysts,*** to the tailorable axial co-s bond in the sAc,the local electronic structure of the co atoms can be further optimized for other photocatalytic *** axial coordination engineering strategy is universal in catalyst designing and can be used for a variety of photocatalytic applications.

关键词： transition metal single-atom local electronic structure photocatalytic hydrogen evolution graphitic carbon nitride axial coordination environment

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Partial collapsing Degeneration of Floer Trajectories and Adiabatic Gluing

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Acta Mathematica sinica,English series 2024年第1期40卷 161-249页

作者： Yong-Geun Oh ke ZhU center for Geometry and Physics Institute for Basic Science(IBS)79 Jigok-ro 127beon-gilNam-guPohang-siGyeongsangbuk-doKorea 37673&POSTECHGyeongsangbuk doKorea Department of Mathematics and statistics Minnesota State UniversityMankatoMN 56001USA

In the present paper,we study partial collapsing degeneration of hamiltonian-perturbed Floer trajectories for an adiabatic ε-family and its reversal adiabatic gluing,as the prototype of the partial collapsing degeneration of 2-dimensional(perturbed)j-holomorphic maps to 1-dimensional gradient *** consider the case when the Floer equations are s^(1)-invariant on parts of their domains whose adiabatic limit has positive length as ε→0,which we call thimble-flow-thimble *** main gluing theorem we prove also applies to the case with lagrangian boundaries such as in the problem of recovering holomorphic disks out of pearly *** particular,our gluing theorem gives rise to a new direct proof of the chain isomorphism property between the Morse-bott version of lagrangian intersection Floer complex of l by Fukaya-Oh-Ohta-Ono and the pearly complex of l lalonde and *** also provides another proof of the present authors’earlier proof of the isomorphism property of the Pss map without involving the target rescaling and the scale-dependent gluing.

关键词： Floer trajectory equation partial collapsing degeneration thimble-flow-thimble moduli space adiabatic gluing exponential decay estimates three-interval method

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青藏高原及其周边侏罗纪综合地层、生物群与古地理演化

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中国科学：地球科学 2024年第4期54卷 1211-1243页

作者：李建国饶馨牟林崔肖辉李鑫罗辉刘培学中国科学院南京地质古生物研究所中国科学院生物演化与环境卓越创新中心南京210008 中国科学院大学南京学院南京211135

侏罗纪是青藏高原构造演化的重要阶段,它结束了古特提斯构造演化,即将迎来印度板块的向北漂移和新特提斯的消减.地层时代是地质历史重建的基础.本文对近年来所取得的一些地层学、古生物新发现和新进展进行了综合和梳理,为青藏高原侏罗... 详细信息

侏罗纪是青藏高原构造演化的重要阶段,它结束了古特提斯构造演化,即将迎来印度板块的向北漂移和新特提斯的消减.地层时代是地质历史重建的基础.本文对近年来所取得的一些地层学、古生物新发现和新进展进行了综合和梳理,为青藏高原侏罗系建立了一个新的多重地层划分对比和时代框架.该框架包括巴颜喀拉、羌塘、拉萨-冈底斯和藏南喜马拉雅四个分区.其中,综合生物地层框架得到了很大的补充和细化,包括了一系列在青藏高原侏罗系中常见并在国际侏罗系划分对比中具有重要作用的化石门类,如海相的菊石、双壳、腕足、放射虫、有孔虫和沟鞭藻以及陆相的孢子花粉和轮藻等.通过菊石标准分子或特征属种,建立了该生物地层框架与国际地层委员会2020年侏罗纪地质年表(GTs 2020)的标准分带的对比.以此为基础,建立了青藏高原主要区块间侏罗系的横向对比.生物群对比揭示,侏罗纪时拉萨-冈底斯区与羌塘区的关系比与藏南喜马拉雅更紧密,它们总体属于东特提斯洋北缘海区同一个特征相似的生物地理区系,不太支持雅鲁藏布江缝合带特提斯是弧后小盆地的观点.综合地层、生物和沉积特征,研究认为,班公湖-怒江特提斯在晚三叠世开始张裂,可能在早侏罗世晚期已有初始洋壳增生形成;中侏罗世晚期班公湖-怒江洋发展至顶峰,随后开始收缩,羌塘地块向南俯冲与拉萨-冈底斯地块发生碰撞和拼合.

关键词：生物地层年代地层特提斯雅鲁藏布缝合带班公湖-怒江缝合带

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comparative analysis of microstructure,mechanical,and corrosion properties of biodegradable Mg-3Y alloy prepared by selective laser melting and spark plasma sintering

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journal of Magnesium and Alloys 2024年第4期12卷 1496-1510页

作者： P.Minárik M.Zemková s.Šašek j.Dittrich M.Knapek F.lukáˇc D.Koutný j.jaroš R.Král Faculty of Mathematics and Physics Charles UniversityKe Karlovu 5Praha 12116Czech Republic Research centre University ofŽilinaUniverzitná8215/1Žilina 01026Slovakia Institute of Plasma Physics of the czech Academy of sciences Za Slovankou 1782/318200 Praha 8Czech Republic Institute of Machine and Industrial Design Brno University of TechnologyTechnická2896/2Brno 61669Czech Republic

This work explored possibilities of biodegradable magnesium alloy Mg-3Y preparation by two modern powder metallurgy techniques–spark plasma sintering(sPs)and selective laser melting(slM).The powder material was consolidated by both methods utilising optimised parameters,which led to very low porosity(∼0.3%)in the slM material and unmeasurably low porosity in the sPs *** main aim of the study was the thorough microstructure characterisation and interrelation between the microstructure and the functional properties,such as mechanical strength,deformability,and corrosion *** materials showed comparable strength of∼110 MPa in tension and compression and relatively good deformability of∼9%and∼21%for the slM and sPs materials,*** corrosion resistance of the sPs material in 0.1 M Nacl solution was superior to the slM one and comparable to the conventional extruded *** digital image correlation during loading and the cross-section analysis of the corrosion layers revealed that the residual porosity and large strained grains have the dominant negative effect on the functional properties of the slM *** the other hand,one of the primary outcomes of this study is that the sPs consolidation method is very effective in the preparation of the W3 biodegradable alloy,resulting in material with convenient mechanical and degradation properties that might find practical applications.

关键词： Magnesium Yttrium Powder metallurgy Microstructure Mechanical strength corrosion resistance

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Electrical stimulation with polypyrrole-coated polycaprolactone/silk fibroin scaffold promotes sacral nerve regeneration by modulating macrophage polarisation

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biomaterials Translational 2024年第2期5卷 157-174页

作者： cheng h. bai j. Zhou x. chen N. jiang Q. Ren Z. li x. su T. liang l. jiang W. Wang Y. Peng j. shang A. school of Medicine Nankai University Tianjin China Department of Neurosurgery Chinese PLA General Hospital Beijing China Institute of Orthopedics Chinese PLA General Hospital Beijing Key Lab of Regenerative Medicine in Orthopedics Key Laboratory of Musculoskeletal Trauma and War Injuries PLA Beijing China co-innovation center of Neuroregeneration Nantong University Jiangsu Province Nantong China Graduate school of chinese PlA General hospital Beijing China Department of Ultrasound Chinese PLA General Hospital Beijing China

Peripheral nerve injury poses a great threat to neurosurgery and limits the regenerative potential of sacral nerves in the neurogenic bladder. It remains unknown whether electrical stimulation can facilitate sacral nerve regeneration in addition to modulate bladder function. The objective of this study was to utilise electrical stimulation in sacra nerve crush injury with newly constructed electroconductive scaffold and explore the role of macrophages in electrical stimulation with crushed nerves. As a result, we generated a polypyrrole-coated polycaprolactone/silk fibroin scaffold through which we applied electrical stimulation. The electrical stimulation boosted nerve regeneration and polarised the macrophages towards the M2 phenotype. An in vitro test using bone marrow derived macrophages revealed that the pro-regenerative polarisation of M2 were significantly enhanced by electrical stimulation. bioinformatics analysis showed that the expression of signal transducer and activator of transcriptions (sTATs) was differentially regulated in a way that promoted M2-related genes expression. Our work indicated the feasibility of electricals stimulation used for sacral nerve regeneration and provided a firm demonstration of a pivotal role which macrophages played in electrical stimulation. © 2024, chinese Medical Multimedia Press co ltd. All rights reserved.

关键词： electrical stimulation jAK-sTAT signalling pathway macrophage polarisation peripheral nerve regeneration polypyrrole sacral nerve injury

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Discussion on the homology Theory of lie Algebras

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journal of Applied Mathematics and Physics 2024年第7期12卷 2367-2376页

作者： lilong kang Yu Wang caiyu Du college of Mathematics and statistics Sichuan University of Science and Engineering Zigong China

because homology on compact homogeneous nilpotent manifolds is closely related to homology on lie algebras, studying homology on lie algebras is helpful for further studying homology on compact homogeneous nilpotent manifolds. so we start with the differential sequence of lie algebras. The lie algebra g has the differential sequence E0,E1,⋯,Es⋯, which leads to the chain complex Es0→Δs0Ess→Δs1⋯→ΔsiEs(i+1)s→Δsi+1⋯of Esby discussing the chain complex E10→Δ10E11→Δ11⋯→Δ1r−1E1r→Δ1r⋯of E1and proves that Es+1i≅hi(Es)=kerΔsi+1/ImΔsiand therefore Es+1≅h(Es)by the chain complex of Es(see Theorem 2).

关键词： lie Algebra Differential sequence Differential Fractional Algebra cohomology

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